code: def test_attribute_assortativity(self):
      a = np.array([[50, 50, 0], [50, 50, 0], [0, 0, 2]])
      r = attribute_ac(a)
      np.testing.assert_almost_equal(r, 0.029, decimal=3)
  
imports: import pytest
  import networkx
  from networkx.algorithms.assortativity.correlation import attribute_ac
  from .base_test import BaseTestAttributeMixing, BaseTestDegreeMixing
label_desc: Use image node_id 6 for calling the TestAttributeMixingCorrelation obj's underlying member method code with example usage: obj.test_attribute_assortativity() without return types